package com.atguigu.paymentdemo.config;


import com.wechat.pay.contrib.apache.httpclient.WechatPayHttpClientBuilder;
import com.wechat.pay.contrib.apache.httpclient.auth.PrivateKeySigner;
import com.wechat.pay.contrib.apache.httpclient.auth.Verifier;
import com.wechat.pay.contrib.apache.httpclient.auth.WechatPay2Credentials;
import com.wechat.pay.contrib.apache.httpclient.auth.WechatPay2Validator;
import com.wechat.pay.contrib.apache.httpclient.cert.CertificatesManager;
import com.wechat.pay.contrib.apache.httpclient.exception.HttpCodeException;
import com.wechat.pay.contrib.apache.httpclient.exception.NotFoundException;
import com.wechat.pay.contrib.apache.httpclient.util.PemUtil;
import lombok.Data;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.impl.client.CloseableHttpClient;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.security.GeneralSecurityException;
import java.security.PrivateKey;


@EnableConfigurationProperties // 开启properties的自定义配置
@Configuration
@PropertySource("classpath:wxpay.properties") //读取配置文件
@ConfigurationProperties(prefix = "wxpay") // 前缀是什么
@Data
public class WxPayConfig {

    // 商户号
    private String mchId;

    // 商户API证书序列号
    private String mchSerialNo;

    // 商户私钥文件
    private String privateKeyPath;

    // APIv3密钥
    private String apiV3Key;

    // APPID
    private String appid;

    // 微信服务器地址
    private String domain;

    // 接收结果通知地址
    private String notifyDomain;

    // 读取商户私钥的方法  filename 文件路径
    public PrivateKey getPrivateKey(String filename) {

        try {
            PrivateKey mechantPrivateKey = PemUtil.loadPrivateKey(
                    new FileInputStream(filename)
            );
            return mechantPrivateKey;
        } catch (FileNotFoundException e) {
            throw new RuntimeException("私钥文件不存在", e);
        }

    }

    /**
     * 返回签名的
     *
     * @return
     */
    @Bean
    public Verifier getVerifier() throws GeneralSecurityException, IOException, HttpCodeException {

        // 获取私钥
        PrivateKey privateKey = getPrivateKey(privateKeyPath);

        // 获取私钥签名对象
        PrivateKeySigner privateKeySigner = new PrivateKeySigner(mchSerialNo, privateKey);

        // 身份认证对象
        WechatPay2Credentials wechatPay2Credentials = new WechatPay2Credentials(mchId, privateKeySigner);


        // 获取证书管理器实例
        CertificatesManager certificatesManager = CertificatesManager.getInstance();

        // 向证书管理器增加需要自动更新平台证书的商户信息
        certificatesManager.putMerchant(mchId, wechatPay2Credentials, apiV3Key.getBytes(StandardCharsets.UTF_8));
        // ... 若有多个商户号，可继续调用putMerchant添加商户信息

        try {
            // 从证书管理器中获取verifier
            Verifier verifier = certificatesManager.getVerifier(mchId);
            return verifier;
        } catch (NotFoundException e) {
            throw new RuntimeException("verifier签名错误", e);
        }

    }

    // 获取微信支付的远程请求对象
    // 获取http请求对象

    /**
     * 获取验签数据
     * @param verifier
     * @return
     * @throws GeneralSecurityException
     * @throws IOException
     * @throws HttpCodeException
     */
    @Bean
    public CloseableHttpClient getWxPayClient(Verifier verifier) throws GeneralSecurityException, IOException, HttpCodeException {

        // 获取私钥
        PrivateKey privateKey = getPrivateKey(privateKeyPath);

        // 获取签名(验签)
//        Verifier verifier = getVerifier();

        WechatPayHttpClientBuilder builder = WechatPayHttpClientBuilder.create()
                .withMerchant(mchId, mchSerialNo, privateKey)
                .withValidator(new WechatPay2Validator(verifier));
        // ... 接下来，你仍然可以通过builder设置各种参数，来配置你的HttpClient

        // 通过WechatPayHttpClientBuilder构造的HttpClient，会自动的处理签名和验签，并进行证书自动更新
        CloseableHttpClient httpClient = builder.build();

        return httpClient;

        // 后面跟使用Apache HttpClient一样
//        CloseableHttpResponse response = httpClient.execute(...);
    }
}
